Merge remote-tracking branch 'origin/deform-terrain'

Two related issues remain:
* Terrain self shadowing is common and handled poorly
* Odd, but mathematically correct patterns/stripes in feature boundaries

Neither of these relate directly to deformation.

1 files changed, 14 insertions, 2 deletions

diff --git a/lib/ray.h b/lib/ray.h
index e1f43c3..a831270 100644
--- a/lib/ray.h
+++ b/lib/ray.h
@@ -43,15 +43,27 @@ public:
 	}
 
 	bool
+	intersectPlane(const PositionType orig, const Direction3D norm, RelativeDistance & distance) const
+	{
+		if constexpr (std::is_floating_point_v<typename PositionType::value_type>) {
+			return glm::intersectRayPlane(start, direction, orig, norm, distance) && distance >= 0.F;
+		}
+		else {
+			const RelativePosition3D origr = orig - start;
+			return glm::intersectRayPlane({}, direction, origr, norm, distance) && distance >= 0.F;
+		}
+	}
+
+	bool
 	intersectTriangle(const PositionType t0, const PositionType t1, const PositionType t2, BaryPosition & bary,
 			RelativeDistance & distance) const
 	{
 		if constexpr (std::is_floating_point_v<typename PositionType::value_type>) {
-			return glm::intersectRayTriangle(start, direction, t0, t1, t2, bary, distance);
+			return glm::intersectRayTriangle(start, direction, t0, t1, t2, bary, distance) && distance >= 0.F;
 		}
 		else {
 			const RelativePosition3D t0r = t0 - start, t1r = t1 - start, t2r = t2 - start;
-			return glm::intersectRayTriangle({}, direction, t0r, t1r, t2r, bary, distance);
+			return glm::intersectRayTriangle({}, direction, t0r, t1r, t2r, bary, distance) && distance >= 0.F;
 		}
 	}